JPS6322280A - Bolt screwing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a bolt tightening machine for tightening a bolt and a nut, and in particular to a bolt tightening machine that prevents incomplete fitting of a depth to an inner sleeve. Regarding.

(Prior art) Generally, in a bolt tightening machine, the tip of the bolt to be cut is fitted into the tip fitting part of the inner sleeve, and the outer sleeve fitted with the nut is rotated by a drive device. A nut is tightened to the same bolt, and when the nut is tightened by the outer sleeve, the reaction force is supported by the tip on the inner sleeve side and the tip is sheared, but this kind of bolt tightening In this machine, even if the tip was incorrectly fitted into the tip fitting part of the inner sleeve, the nut would still be fitted into the nut fitting part of the outer sleeve.

(Problem to be Solved by the Invention) Therefore, in the above-mentioned bolt tightening machine, even if the tip is incorrectly fitted into the tip fitting part of the inner sleeve, the nut remains in the nut fitting part of the outer sleeve. The outer sleeve may be rotated when the bolt or nut is fitted into the outer sleeve, causing damage to the tip or nut and preventing proper tightening of the bolt or nut. Accidental tightening also causes force to be applied to the operator via the tightening lever body, causing accidents.

In view of the above-mentioned drawbacks, the object of the present invention is to provide a bolt.

To provide a bolt tightening machine capable of improving the work and the safety of the work when tightening a nut by ensuring proper fitting of the nut and tip to an outer sleeve and an inner sleeve when tightening the nut. It is in.

(Means for Solving the Problems) In order to achieve the above object, the first invention provides an outer housing which is rotatably mounted on the main body housing and has a fitting part for a nut to be tightened. A sleeve, an inner sleeve that has a fitting part for the tip of the bolt to be tightened and is installed so that it can move forward and backward in the axial direction within the outer sleeve, and can move forward and backward within the inner sleeve. In a bolt tightening machine that tightens bolts and nuts by rotating the outer sleeve with a drive device through a chip removal rod provided on the outer sleeve, a locking groove is formed almost in the vicinity of a nut fitting portion of the outer sleeve. A through window is formed in the inner sleeve from the tip fitting portion to a portion corresponding to the locking groove, and
A stopper is tiltably installed in the through window and faces the inside of the chip fitting part and the locking groove, respectively, and the stopper can operate in conjunction with the chip fitted into the chip fitting part of the inner sleeve. The inner sleeve is configured such that only when the tip is fitted into the tip fitting portion, the tip is tilted and released from the locking groove portion to allow the inner sleeve to move forward and backward in the axial direction. In the second invention, in addition to the above configuration, a switch is provided in the housing to be incorporated into an electric circuit between the drive device and the main switch of the drive device, and a switch of the switch is provided near the switch. An actuating member that cooperates with the contact is tiltably provided, and the actuating member and the chip removal rod in the inner sleeve are interlockably linked.

(Function) The first invention is that when the bolt is sometimes tightened, when the tip is fitted into the tip fitting part of the inner sleeve, the stopper is tilted by the tip and separated from the locking groove. The stopper releases the restraint of the inner sleeve with respect to the outer sleeve, allowing the inner sleeve to move in the axial direction relative to the outer sleeve, and the nut is fitted into the nut fitting part of the outer sleeve and tightening is performed. When the tip is removed from the tip fitting portion of the inner sleeve and the tip is not fitted into the tip fitting portion of the inner sleeve, the tip of the inner sleeve is inserted into the nut fitting portion of the outer sleeve. At the same time, the stopper is located in the locking groove to restrict the movement of the inner sleeve in the axial direction, thereby preventing the nut from fitting into the nut fitting portion of the outer sleeve. In the second invention, in addition to the above-mentioned action, when the chip is not fitted into the chip fitting part, the chip removal rod bends to turn the switch of the drive device to OFFFL, and the depth is fitted into the chip fitting part. Sometimes, the switch is turned on by tilting the operating member by retracting the chip removal rod.
L, corresponds to the ON operation by a trigger installed on the tightening machine body.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 indicates a bolt-tightening body, and the same wooden body 1
A cylindrical outer sleeve 2 is rotatably supported at the tip of the housing 1a, and the outer sleeve 2 has a polygonal nut N to be tightened at the tip of the inner diameter of the outer sleeve 2. A square hole-shaped nut fitting part 3 is formed, and an electric +
- It is configured to be rotated by the motor 4 via rotation transmission means. In the inner diameter portion of the outer sleeve 2, an annular engagement groove 5 having a predetermined width and depth is formed near the rear end (right end in the figure) of the nut fitting portion 3, and the engagement groove 5 A small-diameter inner diameter portion 6 and a large-diameter inner diameter portion 7′ are continuously formed at the rear end (right end in the figure) of 5. Note that the rear end wall surface of the engagement groove 5 is connected to the stopper surface 5a.
The corner portion between the small-diameter inner diameter portion 6 and the large-diameter inner diameter portion 6 is chamfered with an R surface, and the stepped portion 7a between the small-diameter inner diameter portion 6 and the large-diameter inner diameter portion 7 is formed in a tapered shape.

The cylindrical inner sleeve 8 is fitted into the inner diameter of the outer sleeve 2, and its substantially rear end is fitted into a cylindrical support member 9 provided in the housing 1a, so that it can move forward and backward in the axial direction. It is supported movably (back and forth), and a tip fitting part 10 in the shape of a polygonal square hole is formed almost at the tip of the inner diameter part, into which a tip P into which the bolt B to be tightened is to be cut is fitted. , a flange 8 located within the large inner diameter portion 7 of the outer sleeve 2 is located approximately at the center of the outer periphery.
a protrudes, and its front end surface is formed in a tapered shape opposite to the stepped portion 7a within the inner diameter portion of the outer sleeve 2. The inner sleeve 8 has a flange 8a thereof.
A spring 11 is elastically loaded on the outer periphery between the support member 9 and the support member 9.
The inner sleeve 8 is normally biased forward so that its tip portion is located approximately at the tip of the nut fitting portion 3 of the outer sleeve 2. In this biased state, the inner sleeve 8
The tapered mm surface of the flange 8a abuts against the stepped portion 7a within the inner diameter portion of the outer sleeve 2, preventing further movement in the forward direction.

Further, a through window 12 having a rectangular side cross section is provided almost at the tip of the inner sleeve 8, and one side of the through window 12 is connected to the tip fitting portion 101. : It is formed of a communicating square hole 12a and a groove 12b whose other end is open to the outer periphery of the inner sleeve 8 and faces the locking groove 5 of the outer sleeve 2.

The stopper 13, which is built into the through window 12 so as to be tiltable in a loosely fitted manner, has a hook-shaped side cross section, is located in the hole 12a of the through window 12, and has a hemispherical lower end. It consists of a base 13a formed in the shape of a shape, and a locking part 13b that integrally extends laterally from the base 13a and is located in the groove 12'b of the through window 12. An arc-shaped protrusion 14 is bulged out, and the lower surface of the locking portion 13b is a tapered surface 15 that is inclined away from the bottom surface of the groove portion 12b, leaving a root portion at the bottom surface of the locking portion 13b, and the upper surface has a tapered surface similar to the tapered surface 15, and the corner portion at the rear end is formed into a rounded surface shape. A plate-shaped spring 16 is provided on the outside of the base 13a of the stopper 13 and is in contact with the protrusion 14 and is fitted around the outer periphery of the tip of the inner sleeve 8. Due to the biasing force of the spring 16, the stopper 13 normally has a hemispherical lower end portion of its base portion 13a slightly protruding from the hole portion 12a of the through window 12, facing into the tip fitting portion 10 of the inner sleeve 8, and Locking part 1
3b has a lower surface, with the root portion in contact with the bottom surface of the groove portion 12b of the through window 12, and the upper rear end thereof facing into the engagement groove portion 5 of the outer sleeve 2, allowing the inner sleeve 8 to move forward and backward in the axial direction. (forward and backward movement), especially backward movement when working backwards). Therefore, when the tip P to be cut of the bolt B to be tightened is fitted into the chip fitting part 10, the base 13a of the spring 13 resists the biasing force of the spring 16. The locking portion 13 is pushed upward in the figure and is in contact with the bottom surface of the groove portion 12t of the through window 12 due to this pushing up action and the biasing force of the spring 16.
The lower surface of b is tilted clockwise in the drawing with both the root portion and the protruding portion 14 of the base portion 13a in contact with the spring 16 as fulcrums, and the upper rear end of the locking portion 13b is released from the engagement groove portion 5. The inner sleeve 8 moves forward and backward in the axial direction (
This allows for forward and backward movement.

A depth removing rod 1 is disposed within the inner diameter of the inner sleeve 8.
7 is installed so as to be able to reciprocate in the axial direction, and the tip of this tip removal rod 17 is guided and supported by a guide ring 18 that is integrally fitted into the inner sleeve 8, and the tip of the rod 17 is always The inner sleeve 8 is biased forward by a spring 19 so that the inner sleeve 8 faces inside the tip fitting part 10 . Note that the rear end of the chip removal rod 17 faces a part of the inside of the bundle bousing 1b in the housing 1a of the tightening machine main body 1, and also
8 is located behind the tip fitting part 10 of the inner sleeve 8, and prevents the tip P from fitting into the tip fitting part 10 more than necessary and preventing the tip removal rod 17 from protruding more than necessary. ing.

The bundle bouncing 1b is provided with a trigger 21 that turns on the main switch 20 for starting the electric motor, and further the bundle bousing 1
An n1 switch 23 is provided in the inside of the motor through a bracket 22, and this sub switch 23 is installed in series in the electrical circuit between the main switch 20 and the electric motor 4 shown in FIG. be.

In the vicinity of the sub switch 23, an approximately L-shaped actuating member 24 is tiltably supported at its bent portion by a support pin 25, and one actuating piece 2 of the actuating member 24 is
4a is opposed to the contact 23a of the D1 switch 23, and the other actuator 24b is located on the movement locus of the chip removal rod 17 so that its side end surface can be easily connected to the chip removal rod 17. It is composed of Therefore, when the chip removal rod 17 moves backward, the operating member 24 is configured so that the shaft end of the chip removal rod 17 is connected to the other actuation piece 24b.
By climbing on top and pushing down the actuating piece 24b,
It is tilted using the support pin 25 as a fulcrum, and one operating piece 24a
presses the contact 23a of the sub switch 23 to turn on the sub switch 23, and when the chip removal rod 17 is in the advanced state, the contact 23a of the sub switch 23 is reset and activated by the biasing means built into the contact 23a itself. The member 24 is returned to its original state and the sub switch 23 is turned off.

This embodiment is constructed as described above, and its operation will be explained next.

Now, regarding the bolt B and nut N to be tightened, the tip P of the bolt B is attached to the tip fitting part 10 of the inner sleeve 8.
As the inner sleeve 8 is fitted, the inner sleeve 8 is moved slightly backward against the biasing force of the spring 11 due to the frictional resistance between the two due to this fitting operation, but as the inner sleeve 8 moves backward, the stopper 13 Since the rear end upper part of the locking part 13a of the outer sleeve 2 comes into contact with the stopper surface 5a of the rear end wall surface of the engagement groove part 5 of the outer sleeve 2, the rear WIII of the inner sleeve 8 is subsequently closed. In this case, a slight gap is formed between the flange 8a of the inner sleeve 8 and the stepped portion 7a of the outer sleeve 2.

(See Figures 3 and 4.) When the tip P is further fitted into the tip fitting portion 10 until it comes into contact with the guide ring 18, this depth P causes the base 13a of the stopper 13 to move against the spring 1.
It is pushed upward in the figure by the urging force of 6, and
Due to this pushing-up action and the biasing force of the spring 16, the locking portion 1 comes into contact with the bottom surface of the groove portion 12b of the through window 12.
The lower member 3b is tilted clockwise in the drawing using both the root portion and the protruding portion 14 of the base portion 13a that is in contact with the spring 16 as fulcrums, and the upper rear end of the locking portion 13b engages with the stopper surface of the IM portion 5. 5a and this state is maintained, the movement of the inner sleeve 8 forward and backward in the direction of one sleeve (
preperturbation). When the stopper 13 is tilted, the upper part 1i of the locking part 13a of the stopper 13 is aligned with the stopper surface of the rear end wall surface of the engagement groove part 5 of the outer sleeve 2.
a, so that when the inner sleeve 8 is tilted, the inner sleeve 8 is pushed slightly forward to permit the tilting.

(See FIG. 5) When the chip P is fitted, the chip removal rod 17 is moved backward against the biasing force of one spring.

In the above state, the nut N to be tightened is fitted into the nut fitting portion 3 of the outer sleeve 2, and as the nut N is fitted, the inner sleeve 8
is moved backward in the axial direction against the biasing force of the spring 11, allowing the nut N to fit into the nut fitting portion 3.

On the other hand, as described above, when the chip removal rod 17 moves backward, the rear end of the chip removal rod 17 rides on the other actuation piece 24b of the actuating member 24 and presses down the actuating piece 24b. is tilted clockwise in the drawing with the support pin 25 as a fulcrum, and one of the operating pieces 24a pushes the contact 23a of the sub switch 23.
is set to ON state.

Then, in a state in which the nut N is fitted into the nut fitting part 3, the electric motor 4 is driven by turning on the main switch 20 at 21, whereby the outer sub 2 is rotated and the bolt B is turned on. When the predetermined tightening is completed, the tip P fitted into the tip fitting portion 10 of the inner sleeve 8 is cut off from the shaft portion of the bolt B, and the predetermined tightening is completed. finish. This cut chip P is removed from the chip fitting part 10 by the chip removing rod 17 which is moved forward by the biasing force of the spring 19, and by unfitting the nut fitting part 3 to the nut N, the inner The sleeve 8 is returned to its original state by the urging force of the spring 11, and the pushing force of the stopper 13 by the tip P is released, so that it is returned to its original state by the urging force of the spring 16, and its locking portion 13b is located within the engagement groove 5 of the outer sleeve 2.

On the other hand, as described above, since the chip removal rod 17 is also moved forward by the biasing force of the spring 19 and returned to its original state, the operating member 24 is released from the restraint by the chip removal rod 17, so that the sub-switch 23 does not come in contact with the operating member 24. When the contact 23a returns, the contact 23a is returned to its original state by a biasing means built into the contact 23a itself. By this, the sub switch 2
3 to the OF, F state.

In this embodiment, if the tip P is incorrectly fitted into the tip fitting portion 10 of the inner sleeve 8, the stopper 13 will not be tilted 1)+ by the tip P.
Since the engagement between the locking portion 13b of the stopper 13 and the stopper surface 5a of the engagement groove portion 5 of the outer sleeve 2 is maintained,
This prevents the inner sleeve 8 from moving in the axial direction, thereby preventing the nut N from fitting into the nut fitting portion 3 of the outer sleeve 2, and furthermore prevents the tip P from fitting into the tip fitting portion 10 in an incorrect state. When the chip is assembled, the chip removal rod 17, which should be retired due to the same chip, is not retired in a normal state.
The auxiliary switch 23 is not turned on by the operating member 24. Therefore, even if the main switch 20 is turned on by the trigger 21, the electric motor 4 is not driven.

As shown in FIGS. 10 and 11, the actuating member 24 in this embodiment has a flat surface 24c that comes into contact with the side of the chip removal rod 17 and the contact 23a of the sub switch 23.
The actuating member 24d may have a mouth shape, and may be provided in a manner that it can be tilted.

(Effects) As described above, the present invention has an outer sleeve which is rotatably mounted on the main body housing and has a fitting part for a nut to be tightened, and a bolt to be tightened. An inner sleeve that has a fitting portion for the chip to be cut and is installed so that it can move forward and backward in the axial direction within the outer sleeve, and a chip removal rod that is installed inside the inner sleeve so that it can move forward and backward. In a bolt tightening machine that tightens bolts and nuts by rotating the outer sleeve by a drive device, a locking groove is formed in the vicinity of the nut fitting part of the outer sleeve, and a locking groove is formed in the inner sleeve. A through window is formed extending from the tip fitting portion to a portion corresponding to the locking groove portion, and a stopper is tilted in the shell window, which faces the inside of the tip fitting portion and the locking groove portion, respectively. The stopper is configured to be able to operate in conjunction with the chip fitted into the chip fitting portion of the inner sleeve, and is tilted by the tip only when the tip is fitted into the tip fitting portion. The structure is configured such that the inner sleeve is allowed to move back and forth in the axial direction by separating from the locking groove, so that the inner sleeve can be moved back and forth in the axial direction by a stopper that is tilted by the tip of the bolt to be tightened. Therefore, when tightening the bolt, it is necessary to ensure proper fitting of the nut and tip to the outer sleeve and inner sleeve, as well as normal tightening of the bolt and nut. Safety can be improved. Furthermore, a switch is provided in the housing and is incorporated into an electric circuit between the drive device and a main switch of the drive device,
An actuating member that cooperates with the contact of the switch is provided in a tiltable manner near the switch, and the actuating member and the chip removal rod in the inner sleeve are linked together so that the tip is retracted. Unless the switch operated by the chip removal rod and the operating member is turned on, the main switch is turned ON and the drive device is not driven, thereby ensuring proper fitting of the nut and the chip to further improve work safety. Can be done.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a side sectional view of the main part showing the stopper part, Fig. 2 is a side sectional view of the main part showing the bundle bousing part, and Figs. 3 to 5 are the main parts. Fig. 6 is a sectional view taken along the line A-A in Fig. 1;
The figure is a sectional view taken along line B-8 in Figure 1, and Figure 8 is a cross-sectional view taken along line C-C in Figure 4.
FIG. 9 is a line sectional view, FIG. 9 is an electric circuit diagram, FIG. 10 is a sectional view showing the actuating members separately, and FIG. 11 is a perspective view. 1a... Housing 2... Outer sleeve 3... Nut fitting part 4... Electric motor 5...
- Engagement groove part 5a... Stopper surface 8... Inner sleeve 10... Chip fitting part 12... Penetration window 13... Stopper 17... Chip removal rod 20... Main switch 23. ...Sub switch 24
...Applicant for operating parts Stock festival Makita Electric i Manufacturing agent Patent attorney Oka 1) Hidehiko (3 others) Figure 8 Figure 11

Claims (3)

[Claims] (1) an outer sleeve that is rotatably mounted on the main body housing and has a fitting part for a nut to be tightened;
an inner sleeve that has a fitting portion for a tip that cuts a bolt to be tightened and is installed so as to be able to move forward and backward in the axial direction within the outer sleeve; In the bolt tightening machine, the bolt tightening machine is equipped with a chip removal rod and tightens bolts and nuts by rotating the outer sleeve by a drive device, wherein a locking groove is formed in the vicinity of the nut fitting portion of the outer sleeve,
A through window is formed in the inner sleeve from the tip fitting portion to a portion corresponding to the locking groove, and a through window is formed in the through window that faces the inside of the tip fitting portion and the locking groove, respectively. A stopper is installed so as to be tiltable, and the stopper is configured to be able to operate in conjunction with the chip that is fitted into the chip fitting part of the inner sleeve, so that the stopper is tilted by the chip only when the chip is fitted to the chip fitting part. The bolt tightening machine is characterized in that the inner sleeve is moved back and forth in the axial direction by being removed from the locking groove. (2) an outer sleeve rotatably mounted on the main body housing and having a fitting part for a nut to be tightened;
an inner sleeve that has a fitting portion for a tip that cuts a bolt to be tightened and is installed so as to be able to move forward and backward in the axial direction within the outer sleeve; In the bolt tightening machine, the bolt tightening machine is equipped with a chip removal rod and tightens bolts and nuts by rotating the outer sleeve by a drive device, wherein a locking groove is formed in the vicinity of the nut fitting portion of the outer sleeve,
A through window is formed in the inner sleeve from the tip fitting portion to a portion corresponding to the locking groove, and a through window is formed in the through window that faces the inside of the tip fitting portion and the locking groove, respectively. A stopper is installed so as to be tiltable, and the stopper is configured to be able to operate in conjunction with the chip that is fitted into the chip fitting part of the inner sleeve, so that the stopper is tilted by the chip only when the chip is fitted to the chip fitting part. The inner sleeve is disengaged from the locking groove to allow the inner sleeve to move forward and backward in the axial direction, and is further provided in the housing in an electric circuit between the drive device and the main switch of the drive device. A built-in switch is provided, an actuating member that cooperates with a contactor of the switch is tiltably provided near the switch, and the actuating member and the chip removal rod in the inner sleeve are operatively linked. Bolt tightening machine. (3) The stopper is formed by displacing a locking part facing the locking groove and a base facing the tip fitting part in the axial direction of the inner sleeve, and the locking part is always located in the locking groove. 3. The bolt tightening machine according to claim 1, wherein the bolt tightening machine is biased by an elastic member so that the base part faces inside the tip fitting part.